HORIZONTAL SPLIT CASE 2800 PUMP SPECIFICATIONS
PART 1. GENERAL
1.01 This specification includes the supply of ____ horizontal split case pump(s). Pump(s) shall have a maximum ___” diameter suction and ___” diameter discharge. Each unit shall be furnished with a pump, driver, and base with coupling guard. Pumps are to be connected to drivers by suitably sized flexible couplings.
1.02 QUALITY ASSURANCE
A. All pumping equipment furnished under this Section shall be of a design and manufacture that has been used in similar applications, and it shall be demonstrated to the satisfaction of the Owner that the quality is equal to equipment made by that manufacturer specifically named herein.
B. Unit responsibility. Pump(s), complete with motor, coupling, necessary guards and all other specified accessories and appurtenances shall be furnished by the pump manufacturer to insure compatibility and integrity of the individual components, and provide the specified warranty for all components.
C. The horizontal split case pump(s) specified in this section shall be furnished by and be the product of one manufacturer.
D. Pumps are to be engineered and manufactured under a written Quality Assurance program. The Quality Assurance program is to be in effect for at least ten years, to include a written record of periodic internal and external audits to confirm compliance with such program.
E. Pump(s) are to be engineered and manufactured under the certification of ISO-9001:2000.
1.03 PERFORMANCE
A. The pump(s) shall be designed for continuous operation and will be operated continuously under normal service.
B. OPERATION CRITERIA
Flow (GPM) / TDH(ft.) / Max. Pump Speed (RPM) / Max. Solids Passage / Max. Shutoff Head (ft.) / NPSHR @ Rated Condition (ft.)
Design Condition
Secondary Condition
C. Net positive suction head available at the centerline of the pump impeller is ___ feet at ______GPM.
D. Liquid pumped is ______with a maximum temperature of ___ deg. F.
PART 2, PRODUCTS
2.01 PUMPS
A. Manufacturers
1. Pump(s) shall be the product of Fairbanks Nijhuis.
2. Manufacturer shall have installations of like or similar application with a minimum of 5 years service for this pump size.
B. Design
1. Rotation
a. The pump will be (clockwise)(counterclockwise) rotation when viewed from the driver end looking at the pump.
2. Impeller
a. The impeller shall be of the enclosed type, double suction, Francis vane design, to minimize inlet losses and accommodate high suction lifts.
b. Impeller shall be hydraulically and statically balanced to reduce bearing loading.
c. Impellers shall be precision cast in one piece with smooth flow contours to promote maximum efficiency.
d. Impellers shall be fixed axially along the shaft by shaft sleeves and sleeve nuts, and secured to the shaft through a precision fit and full-length key.
e. The impeller hub shall have sufficient metal thickness to allow machining for installation of impeller wear rings.
3. Casing
a. The casing shall be made of close-grained cast iron conforming to ASTM A48 CL30 suitable for _____ PSI working pressure when ____ lb. ANSI discharge flange is used.
b. Casing shall withstand a minimum ____ PSI hydrostatic test.
c. Casing shall consist of upper and lower half castings containing the volute and suction passages, and removable bearing housings that are doweled and securely bolted to the lower half casing. Inboard and outboard bearing housings shall be replaceable without the need for field alignment.
d. Casing shall be axially split along the horizontal shaft centerline with flat-faced suction and discharge flanges and mounting feet cast integral with the lower half casing.
e. Casing shall be lined-bored to assure concentricity and angular alignment.
f. The upper and lower half casings shall be single volute (10”2824A double volute) doweled to permit easy removal and accurate replacement of the upper half for inspection and maintenance. The upper half casing shall be completely removable without disturbing the suction or discharge piping connections.
g. Suction and discharge connections shall be sized to reduce hydraulic friction losses and to reduce turbulence and pipe noise. All suction and discharge flanges shall be designed for straight through nut-and-bolt flange connections. Suction flange shall be 125# ANSI drilling and the discharge flange (125#)(250#) ANSI drilling.
h. Upper half casing shall have a drilled and tapped connection at the highest point on the casing for the purpose of pump priming and/or air release. Lower half casing shall be drilled and tapped to allow for drainage piping.
4. Wear Rings
a. Wear rings shall be provided on both the impeller and casing so that clearances can be maintained throughout the life of the rings and minimize recirculation.
b. Impeller wear rings shall be of the annular type.
c. Casing wear rings shall be of the annular type pinned at the parting flange of the casing to prevent rotation.
d. Wear rings shall be bronze.
5. Bearings
a. Bearings shall be single row and deep groove ball type selected to carry radial and thrust loads.
b. Interchangeable inboard and outboard bearings shall be press fit and positioned onto ground journals on both ends of an accurately machined shaft.
c. Bearing housings shall be doweled and accurately positioned onto the bearing shoulders located on the lower half casing to ensure accurate alignment.
d. Bearings shall be grease lubricated, however, pump and bearing construction shall be such that a change to oil lubrication can be made in the filed, using the same bearings.
e. Bearings shall be designed for an L10 life of 100,000 hours per AFBMA at best efficiency point.
6. Shaft
a. The pump shaft shall be manufactured of high quality heat treated steel of sufficient diameter to allow no greater than 0.003” maximum deflection as measured at the sealing box for all normal performance conditions on the curve.
b. Shaft shall be manufactured to meet stiff shaft construction with a critical speed at least 25% in excess of operating speed, in order to prevent vibration and fatigue.
c. Shaft shall be accurately machined along its entire length. A keyway shall be machined at the coupling end. No threads shall be machined adjacent to the impeller.
7. Sealing Box
a. The sealing box shall be machined into the casing.
b. Sealing box shall contain a two-piece interlocking gland, five (5) rings of synthetic graphite impregnated packing and a water seal ring.
c. External piping complete with snubber valves shall be installed from the casing to each sealing box to circulate sealing water.
8. Baseplate, Coupling and Guard
a. A fabricated steel base for pump and drive is to be supplied. Base shall be designed to resist torsional movement and support the combined weight of both pump and driver.
b. After leveling and alignment, the base shall be grouted and completely filled with a non-shrinking grout.
c. A flexible coupling and an enclosed type coupling guard shall be provided.
9. Testing
a. A certified factory hydrostatic and performance test shall be performed on each pumping unit in accordance with Hydraulic Institute Standards, latest edition. Tests shall be sufficient to determine the curves of head input horsepower, and efficiency relative to capacity from shutoff to 150% of design flow. A minimum of six points, including shutoff, shall be taken for each test. At least one point of the six shall be taken as near as possible to each specified conditions.
b. Results of the performance tests shall be certified by a Registered Professional Engineer and submitted for approval before final shipment.
10. Pumps shall be manufactured by companies whose management system is registered to ISO 9001:2000.